JPS6237777Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic transmission device for an agricultural four-wheel drive vehicle.

In other words, in agricultural 4-wheel drive vehicles that are configured to be slightly faster than both front wheels, the rear wheels usually have a large driving force, and when the load of a working machine is applied to the rear wheels, for example, the tire diameter becomes small. As a result, if the effective diameter of the front wheels increases or the rear wheels sink, the apparent horizontal movement speed decreases and the front wheels become faster, which may cause the front wheels to slip or cause more mud to adhere to the tires. I had a lot of flaws.

The present invention solves these shortcomings, and provides a system that can be carried out suitably without over-driving the front wheels while applying the brakes on the rear wheels, with less mud adhering to the tires, and with good braking. It is something.

Next, the embodiment shown in the drawings will be described.

FIG. 1 shows a side view of an agricultural tractor, which is a four-wheel drive vehicle, in which both front wheels 1, 1, which can be steered by a handle 6, are driven to rotate 2 to 3% faster than both rear wheels 2, 2. It is constructed in the same manner as the conventional structure, with a seat 7, side steps 8, 8, lifts 9, 9 for connecting and lowering the work equipment, etc.

Further, a brake pedal 3 is installed on the side step 8, and the base of an arm 3a that is integrated with the brake pedal 3 is fixed to a shaft cylinder 10, and the shaft cylinder 10 is attached to a horizontal support shaft 11 mounted on the machine body. One end of a link 13 is connected via a pin 14 to the tip of a lever 12 which is rotatably fitted and protrudes upward from the middle part of the shaft cylinder 10, and a brake arm applies a brake to the rear wheel 2. The tip of the link 15 is connected to the other end of the link 13 via a pin 16, and the rear wheel 2 is installed so that the rear wheel 2 can be braked when the brake pedal 3 is depressed, so that the structure is similar to the conventional structure.

Reference numeral 4 designates an arm for low speed operation, which is installed, for example, on the outside of the transmission part 17 of a power shift transmission so that when the arm 4 is rotated, the control operation can be performed toward lower speeds. A wire 18 connected to the shaft tube 10 is extended and inserted into a nearby wire receiver 19, and a compression spring 20 attached to the wire 18 is used to press the arm 4 back to move back. Similarly to the lever 12, the end of the wire 18 extending through the wire receiver 22 is connected to the tip of the lever 21, which is protruded like the lever 12, via a connector 23.

For example, when the front wheels 1 rotate slightly faster than the rear wheels 2 and move forward due to four-wheel drive,
When the work equipment connected to the rear is raised and the machine turns on the headland side of a group, the load on the front and rear wheels changes and the effective diameter of the front wheel 1 increases, and the brake pedal 3 is pressed in the direction of arrow A. When the pedal is depressed as shown, the levers 12 and 21 rotate as shown by the arrow B, rotating the brake arm 15 to brake the rear wheel 2, and pulling the wire 18 to move the arm 4 as shown by the arrow C. As shown in the figure, it is now possible to control the speed of the front wheel 1 to slow down while rotating it, making it possible to control the aircraft to slow down the speed of the front wheel 1 while rotating.As a result, unlike in the past, if the front wheel 1 becomes too fast and slips or gets covered in a lot of mud, the aircraft will no longer be able to turn smoothly. can be done.

Note that when the brake pedal 3 is released, the braking of the rear wheel 2 is released, and the arm 4 moves back due to the elastic force of the compression spring 20 to return to normal.

In this way, the present invention is a four-wheel drive agricultural vehicle configured so that the speed of both front wheels is slightly faster than the speed of both rear wheels. The brake pedal is connected to a low-speed operating arm, which is installed on the outside of the transmission part and can be rotated to set the transmission part to a low gear, via interlocking means such as a wire, so that when the brake pedal is depressed, By applying the brakes to the rear wheels and slowing down the front wheels, it is possible to prevent the front wheels from speeding up and slipping or from getting a lot of mud on the tires, which was the case in the past, and to be able to drive smoothly. It also has the advantage that the brakes can be applied favorably and can be carried out suitably.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of an agricultural tractor, Fig. 2 is a plan view thereof, Fig. 3 is a side view of the main part, and Fig. 4 shows a part of Fig. 3. ,
FIG. 5 shows a plan view of a portion of FIG. 1...front wheel, 2...rear wheel, 3...brake pedal, 4
...Arm for low speed operation.

Claims (1)

[Scope of utility model registration request] In an agricultural 4-wheel drive vehicle configured so that the speed of both front wheels is slightly faster than the speed of both rear wheels, the brake pedal and transmission part are set so that when the brake pedal that applies the rear wheel brake is stepped on, the speed of the front wheel is slowed down. An automatic transmission device characterized in that a low-speed operation arm is installed on the outside and is connected via an interlocking means such as a wire, so that the transmission part can be set to a low speed gear by rotational operation.